Forever- Assumption is correct, a 206. Performance numbers are from Briggs, the motor was fitted with a green slide that is measurably longer than the stock black slide. The motor makes its best torque on the bottom end of the rpm curve, so gear choices & clutch engagement are "test items" that need to be understood by each driver/team. Tracks are rarely the same, meaning it is nearly impossible to guess on this forum exactly what ratio is best for THAT track. Testing is huge! There's a trade-off for 206 racers, needing to understand which track (and class) requires more/less time on the rev-limiter. Some will spend time on the limiter (2-3 seconds) and others, not at all. That's the beauty of racing, personal preference gained though experimenting, and seeing betterment. Heck, two guys can run the same track, identical times, at the same weights, with different gearing! Lower HP racing involves so much more than motor, much like Daytona or Talladega. The driver's feel, understanding of set-up, and strategy is huge. Have fun with it!